CN109686842B - Stretchable flexible display panel and display device - Google Patents
Stretchable flexible display panel and display device Download PDFInfo
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- CN109686842B CN109686842B CN201811598141.2A CN201811598141A CN109686842B CN 109686842 B CN109686842 B CN 109686842B CN 201811598141 A CN201811598141 A CN 201811598141A CN 109686842 B CN109686842 B CN 109686842B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
- H10K77/10—Substrates, e.g. flexible substrates
- H10K77/111—Flexible substrates
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Abstract
The embodiment of the application provides a stretchable flexible display panel and a display device, and the flexible substrates with different elastic moduli are arranged on the flexible display panel, so that good stretchability is realized. The stretchable flexible display panel comprises a display area, wherein the display area comprises a plurality of first sub-display areas, and the first sub-display areas are formed on a first flexible substrate; a plurality of stretching regions formed on a second flexible substrate; wherein the first flexible substrate has a first elastic modulus E1; the second flexible substrate has a second elastic modulus E2, which satisfies the following relationship: the second elastic modulus E2 < the first elastic modulus E1.
Description
[ technical field ] A method for producing a semiconductor device
The application relates to the technical field of display, in particular to a stretchable flexible display panel and a display device.
[ background of the invention ]
With the vigorous development of flat panel Display technology, organic Light Emitting Display (OLED) has been widely used due to its excellent characteristics of self-luminescence, high brightness, wide viewing angle, fast response, etc.
In recent years, the concept of "bendable", "foldable" products has been popularized and popularized in OLED display product design. With the appearance of the flexible display screen, the design concept of the display product is further expanded, and the stretchable function of the flexible display screen gradually becomes a hot subdivision technical field of the flexible OLED display screen. How to ensure the normal display function of the flexible display screen and meet the requirement of the tensile property at the same time becomes an important subject in the field of the current flexible display screens.
[ contents of application ]
In view of this, embodiments of the present disclosure provide a stretchable flexible display panel and a display device, in which flexible substrates having different elastic moduli are disposed on a pair of flexible display panels, so as to achieve good stretchability.
In one aspect, embodiments of the present application provide a stretchable flexible display panel, including a display region,
the display area includes a display area including a display area,
a plurality of first sub-display regions formed on a first flexible substrate;
a plurality of stretching regions formed on a second flexible substrate;
wherein the first flexible substrate has a first elastic modulus E1; the second flexible substrate has a second elastic modulus E2, both satisfying the following relationship:
the second elastic modulus E2 < the first elastic modulus E1.
Optionally, the second elastic modulus E2 is less than 1GPa; the first elastic modulus E1 is 3GPa or less.
Optionally, the first flexible substrate is made of a first flexible polymer material; the second substrate is made of a second flexible high polymer material; wherein the first flexible polymer material comprises one or more of rubber, low-pressure polyethylene or high-pressure polyethylene; the second flexible high polymer material comprises one or more of polydimethylsiloxane, artificial rubber, polyimide, polyether phthalein imine or polyethylene terephthalate.
Optionally, a plurality of the stretching regions are arranged in a staggered manner to define a plurality of first regions arranged in a matrix; the plurality of first sub-display areas are arranged in the first area.
Optionally, there is at least one communication zone between regions; any two adjacent first sub-display regions are electrically connected through the communication region.
Optionally, the display panel further includes a plurality of signal leads, and the signal leads are disposed in the communication area to electrically connect any two adjacent first sub-display areas.
Optionally, the first region has a quadrilateral structure; in a first direction, the side length of the first region is 10-1000 μm; the width of the stretching region in the first direction is 1 μm to 30 μm.
Optionally, the first sub-display area comprises a plurality of pixel units; and no pixel unit is arranged in the stretching area.
Optionally, the first sub-display area comprises a driving array layer formed on the first flexible substrate; a second organic buffer layer is included in the stretching region, and the second organic buffer layer covers the second flexible substrate; the second organic buffer layer has a thickness substantially equal to a thickness of the driving array layer.
Optionally, the driving array layer further comprises a first organic buffer layer; the first organic buffer layer and the second organic buffer layer are formed by patterning the same film layer.
Optionally, an interface is arranged between the first flexible substrate and the second flexible substrate which are arranged adjacently; the first flexible substrate is free of the second organic buffer layer at the interface.
Optionally, the first flexible substrate and the second flexible substrate are made of a same flexible polymer material; and the elastic modulus of the first flexible substrate is larger than that of the second flexible substrate through ultraviolet irradiation treatment.
Optionally, the flexible polymer material comprises one or more of polydimethylsiloxane, elastomer, polyimide, polyether phthalimide, or polyethylene terephthalate; wherein the ultraviolet light treatment comprises the following steps of,
providing a flexible substrate;
shielding a first area of the flexible substrate by using a photomask mask plate, and exposing a second area of the flexible substrate;
irradiating the flexible substrate by ultraviolet light, forming the first flexible substrate from a first region of the flexible substrate; the second flexible substrate is formed from a second region of the flexible substrate.
Optionally, each of the first sub-display regions comprises a flexible encapsulation layer; the flexible packaging layers of the first sub-display areas are mutually independent structures; in the stretching area, the flexible packaging layer is not arranged.
In another aspect, an embodiment of the present application provides a stretchable display device, which includes the above display panel.
The embodiment of the application provides a stretchable flexible display panel and display device, through the flexible substrate that sets up different elastic modulus at display interval and tensile district, wherein, the elastic modulus of tensile district is less than the elastic modulus of display interval for tensile district has better toughness than the display interval, realizes stretching easily or the operation of buckling. Since the display region includes a plurality of pixels for display, it is necessary to secure a certain mechanical strength to prevent damage to the electric devices in the display region when a stretching or bending operation is performed. Such as thin film transistors, metal signal traces, organic light emitting devices, etc., on the driving array, due to the deformation of the display panel caused by the stretching operation. In addition, in the present application, the signal leads connecting the plurality of pixels in the display region pass through the communicating region between the display regions, and the communicating region is included in the display region, and the mechanical strength of the communicating region is compared with that of the stretching region, so that the signal leads can be protected from the risk of disconnection caused by stretching operation.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel provided in an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of the display panel of FIG. 1 along xx' dashed lines;
FIG. 3 is a partially enlarged schematic view of the display panel of FIG. 1;
FIG. 4 is a flow chart illustrating the steps of a flexible substrate processing method according to another embodiment of the present application;
FIG. 5 is a schematic view of the processing step of FIG. 4;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present application.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the description herein, it is to be understood that the terms "substantially", "approximately", "about", "substantially", and the like, as used in the claims and the examples herein, are intended to be generally accepted as not being precise, within the scope of reasonable process operation or tolerance.
It should be understood that although the terms first, second, third, etc. may be used to describe flexible substrates in embodiments of the present application, these flexible substrates should not be limited to these terms. These terms are only used to distinguish flexible substrates from one another. For example, a first flexible substrate may also be referred to as a second flexible substrate, and similarly, a second flexible substrate may also be referred to as a first flexible substrate, without departing from the scope of embodiments herein.
Through intensive research, the applicant of the present application has shown fig. 1 to 5 for solving the problems in the prior art, wherein fig. 1 is a schematic structural diagram of a display panel provided in an embodiment of the present application; FIG. 2 is a schematic cross-sectional view of the display panel of FIG. 1 along xx' dashed lines; FIG. 3 is a partially enlarged schematic view of the display panel of FIG. 1; FIG. 4 is a flow chart of process steps for processing a flexible substrate in yet another embodiment of the present application; FIG. 5 is a schematic view of the processing step of FIG. 4; fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present application. The embodiment of the application provides a stretchable flexible display panel and a display device, and the flexible substrates with different elastic moduli are arranged on the flexible display panel, so that good stretchability is realized.
Specifically, the stretchable flexible display panel comprises a display area, wherein the display area comprises a plurality of first sub-display areas, and the first sub-display areas are formed on a first flexible substrate; a plurality of stretching regions formed on a second flexible substrate; wherein the first flexible substrate has a first elastic modulus E1; the second flexible substrate has a second elastic modulus E2, which satisfies the following relationship: the second elastic modulus E2 < the first elastic modulus E1.
Specifically, as shown in fig. 1 to 3, the present embodiment provides a stretchable display panel 1, and specifically, the display panel 1 may be stretched in a transverse direction along a first direction X and may also be stretched in a longitudinal direction along a second direction Y. It is of course also possible to fold, bend or bend in the first direction X or the second direction Y in a reel-to-reel manner.
In order to implement the stretching operation, the display panel 1 provided in the present application provides a plurality of stretching regions 12 and a plurality of sub-display regions 11 in the display region. Among them, the stretch zone 12 may include a plurality of first stretch zones 12a arranged extending in the first direction X and a second stretch zone 12b arranged extending in the second direction Y. As shown in fig. 1, the first stretching regions 12a disposed in the transverse direction and the second stretching regions 12b disposed in the longitudinal direction are staggered, so as to divide the display area of the display panel 1 into a plurality of first regions 1a, as shown by the dotted rectangle in fig. 1. In a specific embodiment of the present application, the plurality of first regions 1a are arranged in a matrix, and as shown in fig. 1, the plurality of first regions 1a are arranged and aligned in the first direction X in parallel and/or at equal intervals with respect to each other; the plurality of first regions 1a are arranged and aligned in the second direction Y in parallel with each other and/or at equal intervals. Therefore, a regular and more regular matrix structure is formed, and when the stretching operation is performed, because the plurality of first areas 1a are uniformly distributed, the tensile force or the stress received by each first area 1a is more approximate, so that the external tensile force or the internal stress is more uniformly dispersed.
With continued reference to fig. 1, the display area of the display panel 1 is divided into a plurality of first sub-display areas 11 by the stretching area, and each sub-display area 11 is correspondingly disposed in the corresponding first area 1 a. Since the plurality of first regions 1a are arranged in a matrix in one embodiment of the present application, the plurality of sub-display sections 11 are also arranged in a matrix.
In this application embodiment, in order to promote display panel 1's tensile properties, set up the elastic modulus of different regions on display panel 1 through the differentiation for tensile region mainly plays tensile deformation effect when receiving tensile operation, realizes display panel 1's stretchability.
In order to achieve the above object, as shown in fig. 1 to 3, in the present application, different elastic moduli are set by the flexible substrate in the region where the stretching region 12 and the first sub-display region 11 are located on the display panel 1. When the stretching operation is carried out, the stretching operation is preferentially carried out and deformation occurs because the flexibility of the area with small elastic modulus is better. Specifically, as shown in fig. 2, the first flexible substrate 111, which is disposed in the first region 1a where the first sub-display region 11 is located, has a first elastic modulus E1. In the present application, in order to ensure the stretching performance of the display panel 1, it is also necessary for the first flexible substrate of the display area to have good bending and stretching performance. In a specific embodiment, the first elastic modulus E1 of the first flexible substrate 111 needs to be equal to or less than 3GPa, so that the bending or stretching operation can be freely performed. It is necessary for the material of the first flexible substrate 111 to ensure both good flexibility and stable chemical properties of the first flexible substrate 111 during the formation process of the driving array layer T1. Therefore, the first flexible substrate 111 should be made of a flexible polymer material. To this end, in a more specific embodiment of the present application, the first flexible substrate 111 is made of a first flexible polymer material, and specifically may include one or more of rubber, low-pressure polyethylene, or high-pressure polyethylene.
With continued reference to fig. 2, a second flexible substrate 121, having a second elastic modulus E2, is disposed in correspondence with the area where the stretch zone 12 is located. In the present application, in order to ensure the stretching performance of the display panel 1, and in order to realize that the stretching region 12 having no display function is preferentially stretched when the stretching operation is performed, the deformation occurs. In the embodiment of the present application, it is necessary to set the elastic modulus of the second flexible substrate 121 to be smaller than that of the first flexible substrate 111, that is: the second elastic modulus E2 < the first elastic modulus E1. The inventors found through intensive studies that the elastic modulus of the second flexible substrate 121 needs to be less than 1GPa to achieve a good stretching operation. For the material of the second flexible substrate 121, it is necessary to ensure both excellent flexibility and chemical stability of the second flexible substrate 121 during the whole manufacturing process of the display panel 1. Therefore, the second flexible substrate 121 should be made of a flexible polymer material. To this end, in a more specific embodiment of the present application, the second flexible substrate 121 is made of a second flexible polymer material, and specifically may include one or more of polydimethylsiloxane, elastomer, polyimide, poly (ether-phthalide) or polyethylene terephthalate.
In addition, in order to further simplify the formation process of the flexible substrate with differentiated flexibility, the present application also provides another embodiment, specifically as shown in fig. 4, the flexible substrate with different elastic moduli may be formed on the same flexible substrate. Therefore, the process cost caused by splicing two different flexible substrates can be simplified, and meanwhile, the yield of the flexible substrate can be improved.
As shown in fig. 4 to 5, by using the same flexible substrate including a flexible polymer material, specifically, one or more of polydimethylsiloxane, elastomer, polyimide, polyether phthalimide, or polyethylene terephthalate, the elastic modulus of the first flexible substrate 111 is greater than that of the second flexible substrate 121 by the ultraviolet irradiation treatment. The specific treatment process can be as follows:
s1, providing a flexible substrate;
s2: a photomask mask M is adopted, wherein the photomask mask M comprises a first opening H and a shielding area S, the first opening H is correspondingly arranged in the second area 121a of the flexible substrate, and part of the flexible substrate is exposed; the shielding region S is correspondingly disposed on the first region 111a of the flexible substrate,
s3, irradiating the flexible substrate through ultraviolet light, and forming a first flexible substrate 111 from a first area 111a of the flexible substrate; the second flexible substrate 121 is formed of the second region 121a of the flexible substrate, thereby realizing that the elastic modulus of the first flexible substrate 111 is larger than that of the second flexible substrate 121.
The ultraviolet irradiation time can be selected to be different according to different materials of the flexible substrate and different ultraviolet light intensity, and can be from several minutes to several hours. And is not particularly limited in this application.
In the above embodiments, the flexible substrate having a different elastic modulus is formed by performing ultraviolet light treatment on the same flexible substrate. From the process point of view, the method is simple and easy to implement, and the process cost is saved.
With continued reference to fig. 1 to 3, in order to realize that the display panel 1 can be freely stretched, in the embodiment of the present application, a plurality of stretching regions 12 are disposed in a staggered manner in the display region. However, in order to further ensure the stretching region 12, the display panel 1 can achieve the stretching function, and at the same time, the display function of the display region is not affected, so that the situation that the human eyes perceive the separated display of the plurality of first sub-display regions 11 is prevented. In this regard, in an embodiment of the present application, the first region 1a where the first sub-display region 11 is located may have a quadrilateral structure, such as a rectangular or square structure. Wherein, in order to make the control of the stretchability and the internal stress of the entire display panel not excessive, the side length a1 of the first region 1a is set to 10 μm to 1000 μm in the first direction X; accordingly, the width b1 of the second stretching region 12b is set to 1 μm to 30 μm in the first direction X, wherein it is more preferable that the width b1 of the second stretching region 12b is set to 1 μm to 10 μm. Of course, in a more specific embodiment of the present application, for the stretching region 12 further includes the connection region C1, in order to ensure that the connection region C1 can allow the signal lines on the display panel 1 to have a sufficient arrangement space, the width b1 of the second stretching region 12b corresponding to the connection region C1 may be set to be 30 μm at most. In addition, in the present embodiment, the length of the second stretch zone 12b in the second direction Y may be approximately equal to or slightly less than the length of the first region 1a, corresponding to the second stretch zone 12b arranged along the first direction X. So that the second stretch zone 12b forms an elongated opening. Therefore, only stretching can be realized, and the phenomenon that the display separation of the plurality of first sub-display areas 11 is influenced due to overlarge opening width is avoided.
As shown in fig. 1 to fig. 3, it should be noted that, in the present embodiment, no pixel unit PX is disposed in the stretching region 12, and a plurality of corresponding pixel units PX, each of which includes a pixel driving circuit and a light emitting unit OL1, are correspondingly disposed in the first sub-display region 11. Here, the plurality of pixel units PX in the display area are electrically connected to each other, for example, the plurality of pixel units PX located in the same row are supplied with gate driving signals from the same gate signal line to the plurality of pixel units PX in the same row. As shown in fig. 1 to fig. 3 in particular, a communication area C1 is provided between any two adjacent first areas 1a, and the signal leads 113 in the pixel units PX in two adjacent first sub-display areas 11 are arranged in the communication area C1 by winding, so as to electrically connect the pixel units PX in two adjacent first sub-display areas 11. In one embodiment of the present application, the display panel 1 includes signal leads such as gate signal lines 113 extending in a first direction X and data signal leads 115 extending in a second direction Y. For the same gate signal line 113, it supplies gate driving signals to a plurality of pixel units PX located in the same row in a winding arrangement through a plurality of communication areas C1; for the same data signal lead 115, it supplies data driving signals to a plurality of pixel cells PX located in the same column in a winding manner through a plurality of communication areas C1. It should be noted that the connected component C1 is disposed in the first sub-display area 11. In the present application, the signal leads connecting the plurality of pixel units in the display region pass through the communication region between the display regions, and the communication region is included in the display region, and the mechanical strength of the communication region is higher than that of the stretching region, so that the signal leads can be protected from disconnection risk caused by stretching operation.
In order to further protect the stretching region 12 and prevent the second flexible substrate 12 from being lost due to multiple stretching operations, in an embodiment of the present application, the second organic buffer layer 122 is disposed on the second flexible substrate 12 in a covering manner. Since the second organic buffer layer 122 has a large thickness, the second flexible substrate 121 can be protected from being damaged by a stretching or bending operation. Specifically, the plurality of first sub-display regions 11 in the display region include a driving array layer T1, and the driving array layer T1 mainly includes a pixel driving circuit, metal signal traces (such as a gate signal line 113, a data signal lead, a light emission control signal line, a reference potential signal line, and the like), an inorganic insulating layer for insulating, and other organic buffer layers for planarization. In the embodiment of the present application, the driving array layer T1 of the first sub-display region 11 includes a first organic buffer layer 112 made of an organic polymer material and covering the gate signal lead 113 in the driving array layer T1. In one embodiment of the present disclosure, the first organic buffer layer 112 in the first sub-display region 11 and the second organic buffer layer 122 in the stretching region 12 may be formed by the same process, i.e., by patterning the same organic polymer film layer, so as to save the process step of separately forming the second organic buffer layer 122, and thus, the process steps may be simple and easy to implement, and the cost may be low.
In addition, in order to reduce the step difference between the first sub-display region 11 and the stretching region 12, in one embodiment of the present application, the thickness of the second organic buffer layer 122 and the thickness of the driving array layer T1 may be set to be substantially equal. Thereby reduce the disconnected poor between the two to reduce the marginal stress between the two, guarantee when carrying out the tensile operation, external pulling force and the internal stress dispersion in the display panel are even.
In addition, since the stretching operation is required, since the second organic buffer layer 122 having a large thickness is provided on the second flexible substrate 121, the thickness thereof may be up to 30 μm or more. Some internal stresses may be introduced during the stretching operation. In order to alleviate the corresponding stress generation, in one embodiment of the present application, as shown in fig. 2, the second organic buffer layer 122 located at the interface G1 between any adjacent first flexible substrate 11 and second flexible substrate 12 may be removed. Therefore, the edge stress is reduced, and the overall tensile property of the display panel is improved.
With continued reference to fig. 2, in a specific embodiment of the present application, in order to further improve the tensile performance of the display panel, the stress caused by the flexible packaging structure of the display panel is prevented. In the present application, the plurality of first sub-display sections 11 in the display area are independently encapsulated, and no encapsulation layer is disposed in the stretching section 12, so that the internal stress of the display panel 1 is reduced to the greatest extent, and the stretchability thereof is enhanced. Specifically, each of the first sub-display sections 11 includes a flexible encapsulation layer 114 covering the light emitting unit OL1 and the driving array layer T1. The flexible encapsulating layer 114 includes a first inorganic encapsulating layer 114a, a first organic encapsulating layer 114b and a second inorganic encapsulating layer 114c, and a sandwich structure formed by the first inorganic encapsulating layer, the first organic encapsulating layer and the second inorganic encapsulating layer encapsulates the first sub-display region 11, so as to prevent water vapor and oxygen from entering the display panel and causing an influence on the light emitting unit OL1. Since the flexible encapsulation layer 114 includes a plurality of inorganic encapsulation layers (formed of dense oxide), a large internal stress is generated. Therefore, the flexible encapsulation layer 114 is not disposed in the stretching region 12.
An embodiment of the present application further provides a display device, as shown in fig. 6, fig. 6 is a schematic structural diagram of the display device provided in the embodiment of the present application, and the display device includes the display panel 1. The specific structure of the display panel 1 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 6 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
Because the display device provided by the embodiment of the application comprises the display panel, the flexible substrates with different elastic moduli are arranged in the display area and the stretching area, wherein the elastic modulus of the stretching area is smaller than that of the display area, so that the stretching area has better toughness than that of the display area, and the stretching or bending operation is easy to realize. Since the display region includes a plurality of pixels for display, it is necessary to secure a certain mechanical strength to prevent damage to the electrical devices in the display region when a stretching or bending operation is performed. Such as thin film transistors, metal signal traces, organic light emitting devices, etc. on the driving array, which are damaged by the deformation of the display panel caused by the stretching operation. In addition, in the present application, the signal leads connecting the plurality of pixels in the display area pass through the communication area between the display areas, the communication area is included in the display area, and the mechanical strength of the communication area is higher than that of the stretching area, so that the signal leads can be protected from the risk of disconnection caused by stretching operation.
The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (14)
1. A stretchable flexible display panel comprising a display area,
the display area includes a display area including a display area,
a plurality of first sub-display regions formed on a first flexible substrate;
a plurality of stretching regions formed on a second flexible substrate;
wherein the first flexible substrate has a first elastic modulus E1; the second flexible substrate has a second elastic modulus E2, both satisfying the following relationship:
the second elastic modulus E2 is less than the first elastic modulus E1;
the first sub-display area comprises a driving array layer formed on the first flexible substrate;
a second organic buffer layer overlying the second flexible substrate in the stretching region;
the second organic buffer layer has a thickness substantially equal to a thickness of the driving array layer.
2. The display panel according to claim 1, wherein the second elastic modulus E2 is less than 1GPa; the first elastic modulus E1 is 3GPa or less.
3. The display panel according to claim 2, wherein the first flexible substrate is made of a material including a first flexible polymer material; the second flexible substrate is made of a second flexible high polymer material;
wherein the first flexible polymer material comprises one or more of rubber, low-pressure polyethylene or high-pressure polyethylene; the second flexible high polymer material comprises one or more of polydimethylsiloxane, elastomer, polyimide, polyether phthalein imine or polyethylene terephthalate.
4. The display panel according to claim 2, wherein a plurality of the stretching regions are arranged in a staggered manner to define a plurality of first regions arranged in a matrix;
the plurality of first sub-display areas are arranged in the first area.
5. The display panel according to claim 4, wherein at least one communication area is arranged between any two adjacent first areas;
any two adjacent first sub-display regions are electrically connected through the communication region.
6. The display panel according to claim 5, wherein the display panel further comprises a plurality of signal leads, and the signal leads are disposed in the communication area to electrically connect any two adjacent first sub-display areas.
7. The display panel according to claim 4, wherein the first region has a quadrangular structure;
in a first direction, the side length of the first region is 10-1000 μm;
the width of the stretching region in the first direction is 1 to 30 μm.
8. The display panel according to claim 7, wherein the first sub-display region includes a plurality of pixel units;
and no pixel unit is arranged in the stretching area.
9. The display panel of claim 8, wherein the driving array layer further comprises a first organic buffer layer;
the first organic buffer layer and the second organic buffer layer are formed by patterning the same film layer.
10. The display panel according to claim 9, wherein any adjacently disposed first flexible substrate and second flexible substrate has an interface therebetween;
the first flexible substrate is free of the second organic buffer layer at the interface.
11. The display panel according to claim 2, wherein the first flexible substrate and the second flexible substrate are made of a same flexible polymer material;
and the elastic modulus of the first flexible substrate is larger than that of the second flexible substrate through ultraviolet irradiation treatment.
12. The display panel of claim 11, wherein the flexible polymer material comprises one or more of polydimethylsiloxane, elastomer, polyimide, poly-ether-phthalide-imide, or polyethylene terephthalate;
wherein the ultraviolet light treatment comprises the following steps of,
providing a flexible substrate;
shielding a first area of the flexible substrate by using a photomask mask plate, and exposing a second area of the flexible substrate;
irradiating the flexible substrate by ultraviolet light, forming the first flexible substrate from a first region of the flexible substrate; forming the second flexible substrate from a second region of the flexible substrate.
13. The display panel according to any one of claims 1 to 12, wherein each of the first sub-display sections comprises a flexible encapsulation layer; the flexible packaging layers of the first sub-display areas are mutually independent structures;
in the stretching area, the flexible packaging layer is not arranged.
14. A stretchable display device, characterized in that the display device comprises a display panel according to any one of claims 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811598141.2A CN109686842B (en) | 2018-12-26 | 2018-12-26 | Stretchable flexible display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811598141.2A CN109686842B (en) | 2018-12-26 | 2018-12-26 | Stretchable flexible display panel and display device |
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| Publication Number | Publication Date |
|---|---|
| CN109686842A CN109686842A (en) | 2019-04-26 |
| CN109686842B true CN109686842B (en) | 2022-10-14 |
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| CN201811598141.2A Active CN109686842B (en) | 2018-12-26 | 2018-12-26 | Stretchable flexible display panel and display device |
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| US11024584B2 (en) * | 2019-05-29 | 2021-06-01 | Innolux Corporation | Electronic device |
| WO2021031007A1 (en) * | 2019-08-16 | 2021-02-25 | 深圳市柔宇科技有限公司 | Display panel, manufacturing method therefor, and electronic device |
| CN110648979B (en) * | 2019-09-29 | 2021-09-17 | 清华大学 | Integrated flexible substrate and flexible circuit with high stretchability and method of manufacturing the same |
| CN111429803A (en) * | 2020-03-31 | 2020-07-17 | 上海天马微电子有限公司 | Flexible display panel and display device |
| CN111584595B (en) * | 2020-05-26 | 2023-04-18 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN113838398B (en) | 2020-06-24 | 2023-07-18 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN111653205B (en) * | 2020-07-15 | 2021-12-28 | 上海天马微电子有限公司 | Stretchable display panel and display device |
| CN113936557A (en) * | 2021-10-15 | 2022-01-14 | 业成科技（成都）有限公司 | Display device |
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